All spark plugs color are not so good specially #3 is bad . Check compression #1-125psi #2-125psi #3-125psi all good.
Check electric sys of Ignition coil and Stator coil. Resistance and peak V are all good. CDI peak V are good too.
Check carbys looks and working fine but I noticed water came out from chamber of valve vacuum.
Water came out from this mouth of chamber
Also oil feeding pipe nipple is damaged of #2 as one way valve of inside is not work.
Found water leak from pump duct tube as glue is peel off. Need to repair.
Check center bearing housing just in case
Rubber is damaged as nearly cut off. Need to replace new bearing housing assy.